High voltage current limiting fuse for voltage transformer protection is a protective device specifically designed for power systems. Its main function is to quickly cut off the fault current when the voltage transformer is overloaded or short circuited, preventing the accident from escalating. Its core structure includes silver melt, quartz sand arc extinguishing medium, and high alumina ceramic shell, which can forcibly cut off the current before the short-circuit current reaches its peak, limiting the current amplitude to 50%~80%
This fuse is suitable for indoor systems with AC 50Hz and rated voltage of 3.6kV~40.5kV. The commonly used rated current is 0.5A or 1A, and the breaking capacity can reach up to 50kA (12kV system). Unlike ordinary fuses, it adopts a dedicated model (such as XRNP series) to ensure accurate matching with the primary side current of the voltage transformer
Features include low-power design, standardized size, and optional impactor triggered fault signals, widely used in substations and distribution cabinets